<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="ForthServlet" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="text" name="password"><br>
    爱好：<input type="checkbox" name="hobby" value="a">a
    <input type="checkbox" name="hobby" value="b">b
    <input type="checkbox" name="hobby" value="c">c<br>
    <input type="submit" value="提交">
</form>

</body>
</html>